Present a novel method of 3D shape measurement of optical free-from surface based on fringe
projection. A virtual reference surface is proposed which can be used to improve the detection
efficiency and realize the automation of measuring process. Sinusoidal fringe patterns are
projected to the high reflected surface of the measured object. The deflection fringe patterns that
modulated by the object surface are captured by the CCD camera. The slope information can be
obtained by analyzing the relationship between the phase deflectometry and the slope of the object
surface. The wave-front reconstruction method is used to reconstruct the surface. With the
application of fringe projection technology the accuracy of optical free-form surfaces
measurement could reach the level of tens of micrometer or even micrometer.
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